A whole lot of evidence=a lot of hysterisis. That evidence may have been misinterpreted to support a wrong theory. While coal might actually come from organic

A whole lot of evidence=a lot of hysterisis. That evidence may have been misinterpreted to support a wrong theory. While coal might actually come from organic matter from the Carboniferous era as you suggested, I think oil and gas may not. Hydrocarbons are the most abundant things in the solar system (the Oort Cloud might outweigh the entire solar system) and the outer planets are mostly hydrocarbons… and yet all the hydrocarbons on earth come from fossil plants? Thomas Gold wrote a book about it. It’s fascinating reading. Here is a review. https://www.pnas.org/doi/10.1073/pnas.1701266114 https://www.pnas.org/doi/10.1073/pnas.1701266114